Green Synthesized Composite AB-Polybenzimidazole/TiO<sub>2</sub> Membranes with Photocatalytic and Antibacterial Activity
Novel AB-Polybenzimidazole (AB-PBI)/TiO<sub>2</sub> nanocomposite membranes have been prepared using a synthetic green chemistry approach. Modified Eaton’s reagent (methansulfonic acid/P<sub>2</sub>O<sub>5</sub>) was used as both reaction media for microwave-assis...
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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2024-12-01
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| Series: | Crystals |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2073-4352/14/12/1081 |
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| Summary: | Novel AB-Polybenzimidazole (AB-PBI)/TiO<sub>2</sub> nanocomposite membranes have been prepared using a synthetic green chemistry approach. Modified Eaton’s reagent (methansulfonic acid/P<sub>2</sub>O<sub>5</sub>) was used as both reaction media for microwave-assisted synthesis of AB-PBI and as an efficient dispersant of partially agglomerated titanium dioxide powders. Composite membranes of 80 µm thickness have been prepared by a film casting approach involving subsequent anti-solvent inversion in order to obtain porous composite membranes possessing high sorption capacity. The maximal TiO<sub>2</sub> filler content achieved was 20 wt.% TiO<sub>2</sub> nanoparticles (NPs). Titania particles were green synthesized (using a different content of <i>Mentha Spicata</i> (MS) aqueous extract) by hydrothermal activation (150 °C), followed by thermal treatment at 400 °C. The various methods such as powder X-ray diffraction and Thermogravimetric analyses, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy and Energy-dispersive X-ray spectroscopy, Electronic paramagnetic resonance, Scanning Electron Microscopy and Transmission Electron Microscopy have been used to study the phase and surface composition, structure, morphology, and thermal behavior of the synthesized nanocomposite membranes. The photocatalytic ability of the so-prepared AB-Polybenzimidazole/bio-TiO<sub>2</sub> membranes was studied for decolorization of Reactive Black 5 (RB5) as a model azo dye pollutant under UV light illumination. The polymer membrane in basic form, containing TiO<sub>2</sub> particles, was obtained with a 40 mL quantity of the MS extract, exhibiting the highest decolorization rate (96%) after 180 min of UV irradiation. The so-prepared AB-Polybenzimidazole/TiO<sub>2</sub> samples have a powerful antibacterial effect on <i>E. coli</i> when irradiated by UV light. |
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| ISSN: | 2073-4352 |